Also known as a re-circulation valve or diverter valve, used in the forward location*

This is a stock replacement diverter valve which is ideal for stock BMW's. The purpose of a diverter or bypass valve is to redirect the pressurized intake air on turbocharged engines. This most commonly occurs when the throttle plate closes during a shift or coming off the throttle from wide open throttle. The pressurized air in the intake tract outs excess pressure on the compressor wheel in the turbocharger which can lead to eventual failure.

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